A Manual of Philippine Birds

by Richard C. McGregor

Subfamilies.

• a¹. Tarsi unfeathered or with a few feathers only; tail square or but slightly forked; toes arranged normally, three in front one behind. Chæturinæ (p. [352])
• a². Tarsi distinctly feathered; tail decidedly or even deeply forked; all the toes directed forward. Micropodinæ (p. [360])

Subfamily CHÆTURINÆ.

Genera.

• a¹. Shafts of rectrices ordinary and without spinous tips; wing less than 140 mm. Collocalia (p. [352])
• a². Shafts of rectrices stiff and extending in a sharp point beyond the web; wing more than 150 mm. Chætura (p. [357])

Genus COLLOCALIA Gray, 1840.[38]

Hind toe directed backward and only partially reversible; tail short, square or but slightly forked; shafts of rectrices normal, not extending beyond the webs. This genus includes numerous small swifts, several of which build the edible nests of commerce.

Species.

• a¹. Larger; wing, 115 mm. or more; under parts brown; no white on abdomen.
  • b¹. Without whitish or grayish band across rump.
    • c¹. Tail square; tarsi unfeathered. lowi (p. [352])
    • c². Tail slightly forked.
      • d¹. Tarsi entirely devoid of feathers.
      • d². Tarsi sparsely feathered. fuciphaga (p. [354])
  • b². A whitish or grayish band across rump. germani (p. [355])
• a². Smaller; wing, 106 mm. or less; lower parts mottled with white; middle of belly extensively white.
  • b¹. A white band across the rump. troglodytes (p. [355])
  • b². Without white band on rump.
    • c¹. Upper tail-coverts margined with white. marginata (p. [356])
    • c². Upper tail-coverts concolorous with back. isonota (p. [357])